Multipart punch for hydro piercing

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 28/10 (2006.01) B21D 28/28 (2006.01) B21D 28/32 (2006.01) B21D 26/02 (2006.01)

Patent

CA 2658982

A novel multipart punch and system allows apertures to be formed in hydroformed members with the slug which would otherwise result being divided into two or more smaller slugs. These smaller slugs can be folded back into the hydroformed member and held captive therein or removed if desired. The multipart punch and system provides a flush surface in the hydroforming mold when the punch is in its initial position to allow easy loading and unloading of the mold and to allow additional blank to be fed into the mold during the hydroforming operation, if desired. Also, the hydraulic ram used with the multipart punch need develop less force than an equivalent prior art stepped punch.

L'invention porte sur un nouveau poinçon en plusieurs parties permettant de percer des ouvertures dans des éléments hydroformés, en fractionnant la débouchure sans cela formée, en au moins deux débouchures plus petites qui peuvent être repliées dans l'élément hydroformé, et y rester ou en être éliminées. Le poinçon en plusieurs parties et le système associé présentent une surface à fleur avec celle du moule d'hydroformage lorsque le poinçon est en sa position initiale, ce qui facilite le chargement ou le déchargement du moule et permet, si on le désire, d'introduire dans le moule des ébauches additionnelles pendant l'opération d'hydroformage. De plus, le bélier hydraulique utilisé avec le poinçon en plusieurs parties nécessite moins de force que ses équivalents antérieurs.

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